28785061 has 4 divisors (see below), whose sum is σ = 28799500. Its totient is φ = 28770624.

The previous prime is 28785013. The next prime is 28785073. The reversal of 28785061 is 16058782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16058782 = 2 ⋅8029391.

It can be written as a sum of positive squares in 2 ways, for example, as 13032100 + 15752961 = 3610^2 + 3969^2 .

It is a cyclic number.

It is not a de Polignac number, because 28785061 - 2⁹ = 28784549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28785061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3636 + ... + 8413.

It is an arithmetic number, because the mean of its divisors is an integer number (7199875).

Almost surely, 2^28785061 is an apocalyptic number.

It is an amenable number.

28785061 is a deficient number, since it is larger than the sum of its proper divisors (14439).

28785061 is a wasteful number, since it uses less digits than its factorization.

28785061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14438.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28785061 is about 5365.1711063115. The cubic root of 28785061 is about 306.4707642695.

The spelling of 28785061 in words is "twenty-eight million, seven hundred eighty-five thousand, sixty-one".